In various parts of the world, soil phosphorus is associated with which of the following environmental problems?
A) soil degradation because of depletion of soil phosphorus
B) eutrophication of lakes because of a build-up of soil P in the watersheds
C) toxic levels of phosphate in groundwater supplies
D) both A and B
E) all of the above
Question 2
Soluble organic N compounds are taken up by plants and are lost in leaching and runoff waters.
Indicate whether the statement is true or false
